Mind you, thinking outside of the box for perhaps a moment here and maybe taking too much inspiration from other sources. Perhaps we could think about expanding into Particular TYPES of SPV's.
Perhaps one kind of SPV would be based on the design of the APC from the Aliens film, that is to be a personal troop carrier that is capable of fitting into the underside of a flying craft.
Perhaps we could literally have it so that the APC has a HUGE amount of armor, like the tanks, so they can withstand a few hits, but with no weapons though, and perhaps have a feature of the flying craft hovering high above for missile strikes on specific targets
Other kinds of SPV's would be things like Tanks, or converted Riot Vehicles, and perhaps have a feature, much like in Apocalypse, where we could modulate the weapons and armour systems on a vehicle.